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For decades we have been taught that fat is bad for us, carbohydrates are good, and that the key to a healthy weight is eating less and exercising more. Yet with more and more people acting on this advice, we have seen unprecedented epidemics of obesity and diabetes. With seven years of research, Taubes argues persuasively that the problem lies in refined carbohydrates (white flour, sugar, easily digested starches) ?via their dramatic effect on insulin, the hormone that regulates fat accumulation?and that the key to good health is the kind of calories we take in, not the numbers. There are good calories, and bad ones. Taubes traces how the common assumption that carbohydrates are fattening was abandoned in the 1960’s when fat and cholesterol were blamed for heart disease and then?wrongly?were seen as the causes of a host of other maladies, including cancer. He shows us how these unproven hypotheses were emphatically embraced by authorities in nutrition, public health, and clinical medicine, in spite of how well-conceived clinical trials have consistently refuted them. He also documents the dietary trials of carbohydrate-restriction, which consistently show that the fewer carbohydrates we consume, the leaner we will be.

Good Calories Bad Calories is the end of the debate about the foods we consume and their effects on us.

1. Running will give you a heart attack or other heart problems. It is true that exercise temporarily raises the odds of a heart attack while you’re mid-workout, but doing it consistently reduces that risk over the long haul, leading to a net benefit. Some researchers have questioned whether marathon running, especially in people who haven’t trained a lot, might cause heart damage, at least temporarily. But there’s no evidence that it causes long-term harm or actually leads to heart attacks. Even athletes with enlarged hearts—if they’re healthy hearts—aren’t, as once feared, at risk of early death. The bottom line: Simply going for a run most days of the week is doing far more good than bad for your heart.

2. Running will ruin your bones and joints. A study in the August issue of the American Journal of Preventive Medicine found no evidence of accelerated rates of osteoarthritis among long-distance runners when compared with healthy nonrunners. “We used to say that osteoarthritis came from wear and tear. That’s now revised to say that is can result from tear but not wear,” says James Fries, emeritus professor of medicine at the Stanford University School of Medicine and senior author of the study. Moreover, weight-bearing exercise like running helps stave off osteoporosis by maintaining bone mineral density.

3. Running will kill you before your time. According to a study published this week in the Archives of Internal Medicine, running and other vigorous exercise in middle age is associated with a longer life. Not only that, it will make your later years more pleasant by reducing disability. After tracking runners and healthy nonrunners for 21 years, starting when they were at least 50 years old, a research team led by Stanford’s Fries found that the ability to perform activities of daily life like getting out of a chair and walking was better among runners than nonrunners. And 19 years into the study, 15 percent of the runners had died, compared with 34 percent of the nonrunners.USNews.com